Update insta requirement from 0.16.1 to 1.21.0

[dependabot]

Updates the requirements on insta to permit the latest version.

Changelog

Sourced from insta's changelog.

1.21.0

• Fixed an issue that broke support for older rust versions. (#292)
• Added cargo insta show command to render a snapshot.
• Added support for compact JSON snapshots. (#288)

1.20.0

• cargo insta now supports nextest as test runner. (#285)
• The glob! macro now defers failures by default. (#284)

1.19.1

• Added support for numeric keys in JSON which regressed in 0.18.0. (#281)

1.19.0

• Removed backtrace feature.
• Removed serialization feature.
• assert_json_snapshot! and assert_yaml_snapshot! now require the json and yaml feature respectively.
• Doctests now emit a warning that inline snapshot updating is not supported (#272)
• Added support for INSTA_GLOB_FILTER to skip over tests expanded from a glob. (#274)

1.18.2

• Avoid the use of #[allow(unused)] in the macro. (#271)

1.18.1

• Fixed a regression in the JSON serialization format with newtypes and tuple variants. (#270)

1.18.0

• Settings::bind now can return a result.
• Expose the drop guard type of bind_to_scope.
• The serde dependency is now optional. While still enabled by default users need to opt into yaml and json features explicitly to regain support for it. To avoid the default serde dependency the default features just need to be disabled. (#255)
• Deprecated unused serialization features.
• Deprecated unused backtrace feature.
• Removed deprecated Settings::bind_to_thread.

Breaking Changes / Upgrading: If you are upgrading to serde 1.18.0 you will receive deprecating warnings if you are using the assert_yaml_snapshot! and assert_json_snapshot! macros. These macros will continue to function in the

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[dependabot]

The following labels could not be found: C-Dependencies.

[dependabot]

Superseded by #39.